一种基于全相位FFT幅值的频率补偿方法  

A frequency offset compensation method based on all phase FFT amplitude

作　　者：朱颖洁 张武雄[1,3] 易辉跃 许晖[1] ZHU Yingjie;ZHANG Wuxiong;YI Huiyue;XU Hui(Key Laboratory of Science and Technology on Micro-System,Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences,Shanghai 200050,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai micro nano electronics research and development center,Shanghai 201210,China)

机构地区：[1]中国科学院上海微系统与信息技术研究所微系统技术实验室,上海200050 [2]中国科学院大学,北京100049 [3]上海微纳电子研发中心,上海201210

出　　处：《物联网学报》2022年第2期10-18,共9页Chinese Journal on Internet of Things

基　　金：上海市自然科学基金资助项目(No.19ZR1454100);上海市2020年度“科技创新行动计划”基础研究领域项目(No.20JC1416504)。

摘　　要：距离测量是无线定位技术的重要组成部分而基于毫米波的测距精度取决于差频信号的频率估计,但是现有频率估计算法存在计算量大、精度低等问题。为了提高测距精度,对频率估计算法进行了深入研究,提出了一种基于全相位快速傅里叶变换(apFFT,all phasefast Fourier transform)幅值的频率补偿值和频率估计方法,提升了频率估计的性能。该方法首先基于全相位FFT和常规FFT频谱之间的关系,估计出信号幅值。而且,利用信号幅值、信号频谱幅值与频率补偿值之间的关系,采用牛顿迭代算法求解出频率补偿值。然后,利用频率补偿值对信号进行移频后再次估计频率补偿值,得到信号频率的最终估计值,并由此计算目标的距离。仿真结果表明所提方法比现有方法具有更高的距离测量精度。Distance measurement is an important part of the wireless location technology.The ranging accuracy of millimeter wave based distance measurement depends on the frequency estimation accuracy of beat signals from the targets,but the existing frequency estimation algorithms have the shortcomings of either high complexity or low accuracy.In order to improve the ranging accuracy,the frequency compensation value and frequency estimation method based on all phase FFT amplitude was proposed to improve the performance of frequency estimation.Firstly,the signal amplitude was estimated based on the relationship between its all phase FFT and its conventional FFT spectrum.Moreover,using the relationship between the estimated signal amplitude,the signal spectrum amplitude and frequency compensation value,the frequency compensation value was solved by Newton iterative algorithm.Then,the frequency compensation value was used to shift the frequency of the signal,and the frequency compensation value was estimated again to obtain the final estimation value of the signal frequency,from which the distance of the target was calculated.Finally,simulation results were presented to show that the proposed method has higher distance measurement accuracy than the existing methods.

关 键 词：毫米波 定位 测距 频率估计 

分 类 号：TN958.94[电子电信—信号与信息处理]